In Iraq, eight people have been killed and 50 others injured in a car bomb blast on Wednesday, which went off near a police-training centre in Diala.Reports quoting police sources say that the blast caused part of a building to collapse and there are possibilities of more bodies buried in the ruins.Police say that two attackers came in ambulance and one of them shot dead three security guards at the gates of the training centre, opening the way for a second assailant to drive the ambulance in.